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<h1 id="sec_name">
<span data-if="hdevelop" style="display:inline;">hough_lines_dir</span><span data-if="c" style="display:none;">T_hough_lines_dir</span><span data-if="cpp" style="display:none;">HoughLinesDir</span><span data-if="dotnet" style="display:none;">HoughLinesDir</span><span data-if="python" style="display:none;">hough_lines_dir</span> (算子名称)</h1>
<h2>名称</h2>
<p><code><span data-if="hdevelop" style="display:inline;">hough_lines_dir</span><span data-if="c" style="display:none;">T_hough_lines_dir</span><span data-if="cpp" style="display:none;">HoughLinesDir</span><span data-if="dotnet" style="display:none;">HoughLinesDir</span><span data-if="python" style="display:none;">hough_lines_dir</span></code> — Detect lines in edge images with the help of the Hough transform
using local gradient direction and return them in normal form.</p>
<h2 id="sec_synopsis">参数签名</h2>
<div data-if="hdevelop" style="display:inline;">
<p>
<code><b>hough_lines_dir</b>(<a href="#ImageDir"><i>ImageDir</i></a> : <a href="#HoughImage"><i>HoughImage</i></a>, <a href="#Lines"><i>Lines</i></a> : <a href="#DirectionUncertainty"><i>DirectionUncertainty</i></a>, <a href="#AngleResolution"><i>AngleResolution</i></a>, <a href="#Smoothing"><i>Smoothing</i></a>, <a href="#FilterSize"><i>FilterSize</i></a>, <a href="#Threshold"><i>Threshold</i></a>, <a href="#AngleGap"><i>AngleGap</i></a>, <a href="#DistGap"><i>DistGap</i></a>, <a href="#GenLines"><i>GenLines</i></a> : <a href="#Angle"><i>Angle</i></a>, <a href="#Dist"><i>Dist</i></a>)</code></p>
</div>
<div data-if="c" style="display:none;">
<p>
<code>Herror <b>T_hough_lines_dir</b>(const Hobject <a href="#ImageDir"><i>ImageDir</i></a>, Hobject* <a href="#HoughImage"><i>HoughImage</i></a>, Hobject* <a href="#Lines"><i>Lines</i></a>, const Htuple <a href="#DirectionUncertainty"><i>DirectionUncertainty</i></a>, const Htuple <a href="#AngleResolution"><i>AngleResolution</i></a>, const Htuple <a href="#Smoothing"><i>Smoothing</i></a>, const Htuple <a href="#FilterSize"><i>FilterSize</i></a>, const Htuple <a href="#Threshold"><i>Threshold</i></a>, const Htuple <a href="#AngleGap"><i>AngleGap</i></a>, const Htuple <a href="#DistGap"><i>DistGap</i></a>, const Htuple <a href="#GenLines"><i>GenLines</i></a>, Htuple* <a href="#Angle"><i>Angle</i></a>, Htuple* <a href="#Dist"><i>Dist</i></a>)</code></p>
</div>
<div data-if="cpp" style="display:none;">
<p>
<code>void <b>HoughLinesDir</b>(const HObject&amp; <a href="#ImageDir"><i>ImageDir</i></a>, HObject* <a href="#HoughImage"><i>HoughImage</i></a>, HObject* <a href="#Lines"><i>Lines</i></a>, const HTuple&amp; <a href="#DirectionUncertainty"><i>DirectionUncertainty</i></a>, const HTuple&amp; <a href="#AngleResolution"><i>AngleResolution</i></a>, const HTuple&amp; <a href="#Smoothing"><i>Smoothing</i></a>, const HTuple&amp; <a href="#FilterSize"><i>FilterSize</i></a>, const HTuple&amp; <a href="#Threshold"><i>Threshold</i></a>, const HTuple&amp; <a href="#AngleGap"><i>AngleGap</i></a>, const HTuple&amp; <a href="#DistGap"><i>DistGap</i></a>, const HTuple&amp; <a href="#GenLines"><i>GenLines</i></a>, HTuple* <a href="#Angle"><i>Angle</i></a>, HTuple* <a href="#Dist"><i>Dist</i></a>)</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>::<b>HoughLinesDir</b>(HRegion* <a href="#Lines"><i>Lines</i></a>, Hlong <a href="#DirectionUncertainty"><i>DirectionUncertainty</i></a>, Hlong <a href="#AngleResolution"><i>AngleResolution</i></a>, const HString&amp; <a href="#Smoothing"><i>Smoothing</i></a>, Hlong <a href="#FilterSize"><i>FilterSize</i></a>, Hlong <a href="#Threshold"><i>Threshold</i></a>, Hlong <a href="#AngleGap"><i>AngleGap</i></a>, Hlong <a href="#DistGap"><i>DistGap</i></a>, const HString&amp; <a href="#GenLines"><i>GenLines</i></a>, HTuple* <a href="#Angle"><i>Angle</i></a>, HTuple* <a href="#Dist"><i>Dist</i></a>) const</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>::<b>HoughLinesDir</b>(HRegion* <a href="#Lines"><i>Lines</i></a>, Hlong <a href="#DirectionUncertainty"><i>DirectionUncertainty</i></a>, Hlong <a href="#AngleResolution"><i>AngleResolution</i></a>, const char* <a href="#Smoothing"><i>Smoothing</i></a>, Hlong <a href="#FilterSize"><i>FilterSize</i></a>, Hlong <a href="#Threshold"><i>Threshold</i></a>, Hlong <a href="#AngleGap"><i>AngleGap</i></a>, Hlong <a href="#DistGap"><i>DistGap</i></a>, const char* <a href="#GenLines"><i>GenLines</i></a>, HTuple* <a href="#Angle"><i>Angle</i></a>, HTuple* <a href="#Dist"><i>Dist</i></a>) const</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>::<b>HoughLinesDir</b>(HRegion* <a href="#Lines"><i>Lines</i></a>, Hlong <a href="#DirectionUncertainty"><i>DirectionUncertainty</i></a>, Hlong <a href="#AngleResolution"><i>AngleResolution</i></a>, const wchar_t* <a href="#Smoothing"><i>Smoothing</i></a>, Hlong <a href="#FilterSize"><i>FilterSize</i></a>, Hlong <a href="#Threshold"><i>Threshold</i></a>, Hlong <a href="#AngleGap"><i>AngleGap</i></a>, Hlong <a href="#DistGap"><i>DistGap</i></a>, const wchar_t* <a href="#GenLines"><i>GenLines</i></a>, HTuple* <a href="#Angle"><i>Angle</i></a>, HTuple* <a href="#Dist"><i>Dist</i></a>) const  <span class="signnote">
            (
            Windows only)
          </span></code></p>
</div>
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<p>
<code>static void <a href="HOperatorSet.html">HOperatorSet</a>.<b>HoughLinesDir</b>(<a href="HObject.html">HObject</a> <a href="#ImageDir"><i>imageDir</i></a>, out <a href="HObject.html">HObject</a> <a href="#HoughImage"><i>houghImage</i></a>, out <a href="HObject.html">HObject</a> <a href="#Lines"><i>lines</i></a>, <a href="HTuple.html">HTuple</a> <a href="#DirectionUncertainty"><i>directionUncertainty</i></a>, <a href="HTuple.html">HTuple</a> <a href="#AngleResolution"><i>angleResolution</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Smoothing"><i>smoothing</i></a>, <a href="HTuple.html">HTuple</a> <a href="#FilterSize"><i>filterSize</i></a>, <a href="HTuple.html">HTuple</a> <a href="#Threshold"><i>threshold</i></a>, <a href="HTuple.html">HTuple</a> <a href="#AngleGap"><i>angleGap</i></a>, <a href="HTuple.html">HTuple</a> <a href="#DistGap"><i>distGap</i></a>, <a href="HTuple.html">HTuple</a> <a href="#GenLines"><i>genLines</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Angle"><i>angle</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Dist"><i>dist</i></a>)</code></p>
<p>
<code><a href="HImage.html">HImage</a> <a href="HImage.html">HImage</a>.<b>HoughLinesDir</b>(out <a href="HRegion.html">HRegion</a> <a href="#Lines"><i>lines</i></a>, int <a href="#DirectionUncertainty"><i>directionUncertainty</i></a>, int <a href="#AngleResolution"><i>angleResolution</i></a>, string <a href="#Smoothing"><i>smoothing</i></a>, int <a href="#FilterSize"><i>filterSize</i></a>, int <a href="#Threshold"><i>threshold</i></a>, int <a href="#AngleGap"><i>angleGap</i></a>, int <a href="#DistGap"><i>distGap</i></a>, string <a href="#GenLines"><i>genLines</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Angle"><i>angle</i></a>, out <a href="HTuple.html">HTuple</a> <a href="#Dist"><i>dist</i></a>)</code></p>
</div>
<div data-if="python" style="display:none;">
<p>
<code>def <b>hough_lines_dir</b>(<a href="#ImageDir"><i>image_dir</i></a>: HObject, <a href="#DirectionUncertainty"><i>direction_uncertainty</i></a>: int, <a href="#AngleResolution"><i>angle_resolution</i></a>: int, <a href="#Smoothing"><i>smoothing</i></a>: str, <a href="#FilterSize"><i>filter_size</i></a>: int, <a href="#Threshold"><i>threshold</i></a>: int, <a href="#AngleGap"><i>angle_gap</i></a>: int, <a href="#DistGap"><i>dist_gap</i></a>: int, <a href="#GenLines"><i>gen_lines</i></a>: str) -&gt; Tuple[HObject, HObject, Sequence[float], Sequence[float]]</code></p>
</div>
<h2 id="sec_description">描述</h2>
<p>该算子 <code><span data-if="hdevelop" style="display:inline">hough_lines_dir</span><span data-if="c" style="display:none">hough_lines_dir</span><span data-if="cpp" style="display:none">HoughLinesDir</span><span data-if="com" style="display:none">HoughLinesDir</span><span data-if="dotnet" style="display:none">HoughLinesDir</span><span data-if="python" style="display:none">hough_lines_dir</span></code> selects line-like
structures in a region based on the Hough transform. The individual
points of a line can be unconnected. The region is given by the domain
of <a href="#ImageDir"><i><code><span data-if="hdevelop" style="display:inline">ImageDir</span><span data-if="c" style="display:none">ImageDir</span><span data-if="cpp" style="display:none">ImageDir</span><span data-if="com" style="display:none">ImageDir</span><span data-if="dotnet" style="display:none">imageDir</span><span data-if="python" style="display:none">image_dir</span></code></i></a>.
</p>
<p>In contrast to <a href="hough_lines.html"><code><span data-if="hdevelop" style="display:inline">hough_lines</span><span data-if="c" style="display:none">hough_lines</span><span data-if="cpp" style="display:none">HoughLines</span><span data-if="com" style="display:none">HoughLines</span><span data-if="dotnet" style="display:none">HoughLines</span><span data-if="python" style="display:none">hough_lines</span></code></a>, additionally the edge direction in
<a href="#ImageDir"><i><code><span data-if="hdevelop" style="display:inline">ImageDir</span><span data-if="c" style="display:none">ImageDir</span><span data-if="cpp" style="display:none">ImageDir</span><span data-if="com" style="display:none">ImageDir</span><span data-if="dotnet" style="display:none">imageDir</span><span data-if="python" style="display:none">image_dir</span></code></i></a> (e.g., returned by <a href="sobel_dir.html"><code><span data-if="hdevelop" style="display:inline">sobel_dir</span><span data-if="c" style="display:none">sobel_dir</span><span data-if="cpp" style="display:none">SobelDir</span><span data-if="com" style="display:none">SobelDir</span><span data-if="dotnet" style="display:none">SobelDir</span><span data-if="python" style="display:none">sobel_dir</span></code></a> or
<a href="edges_image.html"><code><span data-if="hdevelop" style="display:inline">edges_image</span><span data-if="c" style="display:none">edges_image</span><span data-if="cpp" style="display:none">EdgesImage</span><span data-if="com" style="display:none">EdgesImage</span><span data-if="dotnet" style="display:none">EdgesImage</span><span data-if="python" style="display:none">edges_image</span></code></a>) is taken into account. This results in a more efficient
computation and in a reduction of the noise in the Hough space.
</p>
<p>The parameter <a href="#DirectionUncertainty"><i><code><span data-if="hdevelop" style="display:inline">DirectionUncertainty</span><span data-if="c" style="display:none">DirectionUncertainty</span><span data-if="cpp" style="display:none">DirectionUncertainty</span><span data-if="com" style="display:none">DirectionUncertainty</span><span data-if="dotnet" style="display:none">directionUncertainty</span><span data-if="python" style="display:none">direction_uncertainty</span></code></i></a> describes how much the edge
direction of the individual points within a line is allowed to vary. For
example, with <a href="#DirectionUncertainty"><i><code><span data-if="hdevelop" style="display:inline">DirectionUncertainty</span><span data-if="c" style="display:none">DirectionUncertainty</span><span data-if="cpp" style="display:none">DirectionUncertainty</span><span data-if="com" style="display:none">DirectionUncertainty</span><span data-if="dotnet" style="display:none">directionUncertainty</span><span data-if="python" style="display:none">direction_uncertainty</span></code></i></a> = <i>10</i> a horizontal
line (i.e., edge direction = 0 degrees) may contain points with an edge
direction between -10 and +10 degrees. The higher
<a href="#DirectionUncertainty"><i><code><span data-if="hdevelop" style="display:inline">DirectionUncertainty</span><span data-if="c" style="display:none">DirectionUncertainty</span><span data-if="cpp" style="display:none">DirectionUncertainty</span><span data-if="com" style="display:none">DirectionUncertainty</span><span data-if="dotnet" style="display:none">directionUncertainty</span><span data-if="python" style="display:none">direction_uncertainty</span></code></i></a> is chosen, the higher the computation time
will be. For <a href="#DirectionUncertainty"><i><code><span data-if="hdevelop" style="display:inline">DirectionUncertainty</span><span data-if="c" style="display:none">DirectionUncertainty</span><span data-if="cpp" style="display:none">DirectionUncertainty</span><span data-if="com" style="display:none">DirectionUncertainty</span><span data-if="dotnet" style="display:none">directionUncertainty</span><span data-if="python" style="display:none">direction_uncertainty</span></code></i></a> =  <i>180</i>
<code><span data-if="hdevelop" style="display:inline">hough_lines_dir</span><span data-if="c" style="display:none">hough_lines_dir</span><span data-if="cpp" style="display:none">HoughLinesDir</span><span data-if="com" style="display:none">HoughLinesDir</span><span data-if="dotnet" style="display:none">HoughLinesDir</span><span data-if="python" style="display:none">hough_lines_dir</span></code> shows the same behavior as
<a href="hough_lines.html"><code><span data-if="hdevelop" style="display:inline">hough_lines</span><span data-if="c" style="display:none">hough_lines</span><span data-if="cpp" style="display:none">HoughLines</span><span data-if="com" style="display:none">HoughLines</span><span data-if="dotnet" style="display:none">HoughLines</span><span data-if="python" style="display:none">hough_lines</span></code></a>, i.e., the edge direction is ignored.
<a href="#DirectionUncertainty"><i><code><span data-if="hdevelop" style="display:inline">DirectionUncertainty</span><span data-if="c" style="display:none">DirectionUncertainty</span><span data-if="cpp" style="display:none">DirectionUncertainty</span><span data-if="com" style="display:none">DirectionUncertainty</span><span data-if="dotnet" style="display:none">directionUncertainty</span><span data-if="python" style="display:none">direction_uncertainty</span></code></i></a> should be chosen at least as high as the
step width of the edge direction stored in <a href="#ImageDir"><i><code><span data-if="hdevelop" style="display:inline">ImageDir</span><span data-if="c" style="display:none">ImageDir</span><span data-if="cpp" style="display:none">ImageDir</span><span data-if="com" style="display:none">ImageDir</span><span data-if="dotnet" style="display:none">imageDir</span><span data-if="python" style="display:none">image_dir</span></code></i></a>. The minimum
step width is 2 degrees (defined by the image type 'direction').
</p>
<p>The parameter <a href="#AngleResolution"><i><code><span data-if="hdevelop" style="display:inline">AngleResolution</span><span data-if="c" style="display:none">AngleResolution</span><span data-if="cpp" style="display:none">AngleResolution</span><span data-if="com" style="display:none">AngleResolution</span><span data-if="dotnet" style="display:none">angleResolution</span><span data-if="python" style="display:none">angle_resolution</span></code></i></a> defines how accurately the
angles are determined. The accuracy amounts to 1 /
<a href="#AngleResolution"><i><code><span data-if="hdevelop" style="display:inline">AngleResolution</span><span data-if="c" style="display:none">AngleResolution</span><span data-if="cpp" style="display:none">AngleResolution</span><span data-if="com" style="display:none">AngleResolution</span><span data-if="dotnet" style="display:none">angleResolution</span><span data-if="python" style="display:none">angle_resolution</span></code></i></a> degrees.  A subsequent smoothing of the
Hough space results in an increased stability. The smoothing filter can be
selected by <a href="#Smoothing"><i><code><span data-if="hdevelop" style="display:inline">Smoothing</span><span data-if="c" style="display:none">Smoothing</span><span data-if="cpp" style="display:none">Smoothing</span><span data-if="com" style="display:none">Smoothing</span><span data-if="dotnet" style="display:none">smoothing</span><span data-if="python" style="display:none">smoothing</span></code></i></a>, the degree of smoothing by the
parameter <a href="#FilterSize"><i><code><span data-if="hdevelop" style="display:inline">FilterSize</span><span data-if="c" style="display:none">FilterSize</span><span data-if="cpp" style="display:none">FilterSize</span><span data-if="com" style="display:none">FilterSize</span><span data-if="dotnet" style="display:none">filterSize</span><span data-if="python" style="display:none">filter_size</span></code></i></a> (see <a href="mean_image.html"><code><span data-if="hdevelop" style="display:inline">mean_image</span><span data-if="c" style="display:none">mean_image</span><span data-if="cpp" style="display:none">MeanImage</span><span data-if="com" style="display:none">MeanImage</span><span data-if="dotnet" style="display:none">MeanImage</span><span data-if="python" style="display:none">mean_image</span></code></a> or
<a href="gauss_image.html"><code><span data-if="hdevelop" style="display:inline">gauss_image</span><span data-if="c" style="display:none">gauss_image</span><span data-if="cpp" style="display:none">GaussImage</span><span data-if="com" style="display:none">GaussImage</span><span data-if="dotnet" style="display:none">GaussImage</span><span data-if="python" style="display:none">gauss_image</span></code></a> for details).
The parameter <a href="#Threshold"><i><code><span data-if="hdevelop" style="display:inline">Threshold</span><span data-if="c" style="display:none">Threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">threshold</span><span data-if="python" style="display:none">threshold</span></code></i></a>
determines by how many points of the original region a line's hypothesis
must at least be supported in order to be selected into the output.
The parameters <a href="#AngleGap"><i><code><span data-if="hdevelop" style="display:inline">AngleGap</span><span data-if="c" style="display:none">AngleGap</span><span data-if="cpp" style="display:none">AngleGap</span><span data-if="com" style="display:none">AngleGap</span><span data-if="dotnet" style="display:none">angleGap</span><span data-if="python" style="display:none">angle_gap</span></code></i></a> and <a href="#DistGap"><i><code><span data-if="hdevelop" style="display:inline">DistGap</span><span data-if="c" style="display:none">DistGap</span><span data-if="cpp" style="display:none">DistGap</span><span data-if="com" style="display:none">DistGap</span><span data-if="dotnet" style="display:none">distGap</span><span data-if="python" style="display:none">dist_gap</span></code></i></a> define a
neighborhood of the points in the Hough image in order to determine the
local maxima: <a href="#AngleGap"><i><code><span data-if="hdevelop" style="display:inline">AngleGap</span><span data-if="c" style="display:none">AngleGap</span><span data-if="cpp" style="display:none">AngleGap</span><span data-if="com" style="display:none">AngleGap</span><span data-if="dotnet" style="display:none">angleGap</span><span data-if="python" style="display:none">angle_gap</span></code></i></a> describes the minimum distance of two
maxima in the Hough image in angle direction and <a href="#DistGap"><i><code><span data-if="hdevelop" style="display:inline">DistGap</span><span data-if="c" style="display:none">DistGap</span><span data-if="cpp" style="display:none">DistGap</span><span data-if="com" style="display:none">DistGap</span><span data-if="dotnet" style="display:none">distGap</span><span data-if="python" style="display:none">dist_gap</span></code></i></a> in
distance direction, respectively. Thus, maxima exceeding
<a href="#Threshold"><i><code><span data-if="hdevelop" style="display:inline">Threshold</span><span data-if="c" style="display:none">Threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">threshold</span><span data-if="python" style="display:none">threshold</span></code></i></a> but lying close to an even higher maximum are eliminated.
If multiple maxima in this neighborhood are equally high, all of them are
returned. This elimination can particularly be helpful when searching for
short and long lines simultaneously. Besides the not smoothed Hough image
<a href="#HoughImage"><i><code><span data-if="hdevelop" style="display:inline">HoughImage</span><span data-if="c" style="display:none">HoughImage</span><span data-if="cpp" style="display:none">HoughImage</span><span data-if="com" style="display:none">HoughImage</span><span data-if="dotnet" style="display:none">houghImage</span><span data-if="python" style="display:none">hough_image</span></code></i></a>, the lines are returned in Hessian Normal Form (HNF),
that is by the direction <a href="#Angle"><i><code><span data-if="hdevelop" style="display:inline">Angle</span><span data-if="c" style="display:none">Angle</span><span data-if="cpp" style="display:none">Angle</span><span data-if="com" style="display:none">Angle</span><span data-if="dotnet" style="display:none">angle</span><span data-if="python" style="display:none">angle</span></code></i></a> and length <a href="#Dist"><i><code><span data-if="hdevelop" style="display:inline">Dist</span><span data-if="c" style="display:none">Dist</span><span data-if="cpp" style="display:none">Dist</span><span data-if="com" style="display:none">Dist</span><span data-if="dotnet" style="display:none">dist</span><span data-if="python" style="display:none">dist</span></code></i></a> of their
normal vectors.
If the parameter <a href="#GenLines"><i><code><span data-if="hdevelop" style="display:inline">GenLines</span><span data-if="c" style="display:none">GenLines</span><span data-if="cpp" style="display:none">GenLines</span><span data-if="com" style="display:none">GenLines</span><span data-if="dotnet" style="display:none">genLines</span><span data-if="python" style="display:none">gen_lines</span></code></i></a> is set to <i><span data-if="hdevelop" style="display:inline">'true'</span><span data-if="c" style="display:none">"true"</span><span data-if="cpp" style="display:none">"true"</span><span data-if="com" style="display:none">"true"</span><span data-if="dotnet" style="display:none">"true"</span><span data-if="python" style="display:none">"true"</span></i>, additionally
those regions in <a href="#ImageDir"><i><code><span data-if="hdevelop" style="display:inline">ImageDir</span><span data-if="c" style="display:none">ImageDir</span><span data-if="cpp" style="display:none">ImageDir</span><span data-if="com" style="display:none">ImageDir</span><span data-if="dotnet" style="display:none">imageDir</span><span data-if="python" style="display:none">image_dir</span></code></i></a> are returned that contributed to the
local maxima in Hough space. They are stored in the parameter
<a href="#Lines"><i><code><span data-if="hdevelop" style="display:inline">Lines</span><span data-if="c" style="display:none">Lines</span><span data-if="cpp" style="display:none">Lines</span><span data-if="com" style="display:none">Lines</span><span data-if="dotnet" style="display:none">lines</span><span data-if="python" style="display:none">lines</span></code></i></a>.</p>
<h2 id="sec_execution">运行信息</h2>
<ul>
  <li>多线程类型:可重入(与非独占操作符并行运行)。</li>
<li>多线程作用域:全局(可以从任何线程调用)。</li>
  <li>未经并行化处理。</li>
</ul>
<h2 id="sec_parameters">参数表</h2>
  <div class="par">
<div class="parhead">
<span id="ImageDir" class="parname"><b><code><span data-if="hdevelop" style="display:inline">ImageDir</span><span data-if="c" style="display:none">ImageDir</span><span data-if="cpp" style="display:none">ImageDir</span><span data-if="com" style="display:none">ImageDir</span><span data-if="dotnet" style="display:none">imageDir</span><span data-if="python" style="display:none">image_dir</span></code></b> (input_object)  </span><span>singlechannelimage <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject</span> (direction)</span>
</div>
<p class="pardesc">Image containing the edge direction. The edges are
described by the image domain.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="HoughImage" class="parname"><b><code><span data-if="hdevelop" style="display:inline">HoughImage</span><span data-if="c" style="display:none">HoughImage</span><span data-if="cpp" style="display:none">HoughImage</span><span data-if="com" style="display:none">HoughImage</span><span data-if="dotnet" style="display:none">houghImage</span><span data-if="python" style="display:none">hough_image</span></code></b> (output_object)  </span><span>image <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HImage.html">HImage</a></span><span data-if="c" style="display:none">Hobject *</span> (uint2)</span>
</div>
<p class="pardesc">Hough transform.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Lines" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Lines</span><span data-if="c" style="display:none">Lines</span><span data-if="cpp" style="display:none">Lines</span><span data-if="com" style="display:none">Lines</span><span data-if="dotnet" style="display:none">lines</span><span data-if="python" style="display:none">lines</span></code></b> (output_object)  </span><span>region-array <code>→</code> <span data-if="hdevelop" style="display:inline">object</span><span data-if="dotnet" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="python" style="display:none">HObject</span><span data-if="cpp" style="display:none"><a href="HRegion.html">HRegion</a></span><span data-if="c" style="display:none">Hobject *</span></span>
</div>
<p class="pardesc">Regions of the input image that contributed to the
local maxima.</p>
</div>
  <div class="par">
<div class="parhead">
<span id="DirectionUncertainty" class="parname"><b><code><span data-if="hdevelop" style="display:inline">DirectionUncertainty</span><span data-if="c" style="display:none">DirectionUncertainty</span><span data-if="cpp" style="display:none">DirectionUncertainty</span><span data-if="com" style="display:none">DirectionUncertainty</span><span data-if="dotnet" style="display:none">directionUncertainty</span><span data-if="python" style="display:none">direction_uncertainty</span></code></b> (input_control)  </span><span>angle.deg <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Uncertainty of edge direction (in degrees).</p>
<p class="pardesc"><span class="parcat">Default:
      </span>2</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>2
          ≤
        
    <span data-if="hdevelop" style="display:inline">DirectionUncertainty</span>
    <span data-if="c" style="display:none">DirectionUncertainty</span>
    <span data-if="cpp" style="display:none">DirectionUncertainty</span>
    <span data-if="com" style="display:none">DirectionUncertainty</span>
    <span data-if="dotnet" style="display:none">directionUncertainty</span>
    <span data-if="python" style="display:none">direction_uncertainty</span>
    
          ≤
          180</code></p>
<p class="pardesc"><span class="parcat">Minimum increment:
      </span>2</p>
</div>
  <div class="par">
<div class="parhead">
<span id="AngleResolution" class="parname"><b><code><span data-if="hdevelop" style="display:inline">AngleResolution</span><span data-if="c" style="display:none">AngleResolution</span><span data-if="cpp" style="display:none">AngleResolution</span><span data-if="com" style="display:none">AngleResolution</span><span data-if="dotnet" style="display:none">angleResolution</span><span data-if="python" style="display:none">angle_resolution</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Resolution in the angle area (in 1/degrees).</p>
<p class="pardesc"><span class="parcat">Default:
      </span>4</p>
<p class="pardesc"><span class="parcat">List of values:
      </span>1, 2, 4, 8</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Smoothing" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Smoothing</span><span data-if="c" style="display:none">Smoothing</span><span data-if="cpp" style="display:none">Smoothing</span><span data-if="com" style="display:none">Smoothing</span><span data-if="dotnet" style="display:none">smoothing</span><span data-if="python" style="display:none">smoothing</span></code></b> (input_control)  </span><span>string <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">str</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (string)</span><span data-if="dotnet" style="display:none"> (<i>string</i>)</span><span data-if="cpp" style="display:none"> (<i>HString</i>)</span><span data-if="c" style="display:none"> (<i>char*</i>)</span></span>
</div>
<p class="pardesc">Smoothing filter for hough image.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>
    <span data-if="hdevelop" style="display:inline">'mean'</span>
    <span data-if="c" style="display:none">"mean"</span>
    <span data-if="cpp" style="display:none">"mean"</span>
    <span data-if="com" style="display:none">"mean"</span>
    <span data-if="dotnet" style="display:none">"mean"</span>
    <span data-if="python" style="display:none">"mean"</span>
</p>
<p class="pardesc"><span class="parcat">List of values:
      </span><span data-if="hdevelop" style="display:inline">'gauss'</span><span data-if="c" style="display:none">"gauss"</span><span data-if="cpp" style="display:none">"gauss"</span><span data-if="com" style="display:none">"gauss"</span><span data-if="dotnet" style="display:none">"gauss"</span><span data-if="python" style="display:none">"gauss"</span>, <span data-if="hdevelop" style="display:inline">'mean'</span><span data-if="c" style="display:none">"mean"</span><span data-if="cpp" style="display:none">"mean"</span><span data-if="com" style="display:none">"mean"</span><span data-if="dotnet" style="display:none">"mean"</span><span data-if="python" style="display:none">"mean"</span>, <span data-if="hdevelop" style="display:inline">'none'</span><span data-if="c" style="display:none">"none"</span><span data-if="cpp" style="display:none">"none"</span><span data-if="com" style="display:none">"none"</span><span data-if="dotnet" style="display:none">"none"</span><span data-if="python" style="display:none">"none"</span></p>
</div>
  <div class="par">
<div class="parhead">
<span id="FilterSize" class="parname"><b><code><span data-if="hdevelop" style="display:inline">FilterSize</span><span data-if="c" style="display:none">FilterSize</span><span data-if="cpp" style="display:none">FilterSize</span><span data-if="com" style="display:none">FilterSize</span><span data-if="dotnet" style="display:none">filterSize</span><span data-if="python" style="display:none">filter_size</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Required smoothing filter size.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>5</p>
<p class="pardesc"><span class="parcat">List of values:
      </span>3, 5, 7, 9, 11</p>
</div>
  <div class="par">
<div class="parhead">
<span id="Threshold" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Threshold</span><span data-if="c" style="display:none">Threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">threshold</span><span data-if="python" style="display:none">threshold</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Threshold value in the Hough image.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>100</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>1
          ≤
        
    <span data-if="hdevelop" style="display:inline">Threshold</span>
    <span data-if="c" style="display:none">Threshold</span>
    <span data-if="cpp" style="display:none">Threshold</span>
    <span data-if="com" style="display:none">Threshold</span>
    <span data-if="dotnet" style="display:none">threshold</span>
    <span data-if="python" style="display:none">threshold</span>
    </code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="AngleGap" class="parname"><b><code><span data-if="hdevelop" style="display:inline">AngleGap</span><span data-if="c" style="display:none">AngleGap</span><span data-if="cpp" style="display:none">AngleGap</span><span data-if="com" style="display:none">AngleGap</span><span data-if="dotnet" style="display:none">angleGap</span><span data-if="python" style="display:none">angle_gap</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Minimum distance of two maxima in the Hough image
(direction: angle).</p>
<p class="pardesc"><span class="parcat">Default:
      </span>5</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>0
          ≤
        
    <span data-if="hdevelop" style="display:inline">AngleGap</span>
    <span data-if="c" style="display:none">AngleGap</span>
    <span data-if="cpp" style="display:none">AngleGap</span>
    <span data-if="com" style="display:none">AngleGap</span>
    <span data-if="dotnet" style="display:none">angleGap</span>
    <span data-if="python" style="display:none">angle_gap</span>
    </code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="DistGap" class="parname"><b><code><span data-if="hdevelop" style="display:inline">DistGap</span><span data-if="c" style="display:none">DistGap</span><span data-if="cpp" style="display:none">DistGap</span><span data-if="com" style="display:none">DistGap</span><span data-if="dotnet" style="display:none">distGap</span><span data-if="python" style="display:none">dist_gap</span></code></b> (input_control)  </span><span>integer <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">int</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (integer)</span><span data-if="dotnet" style="display:none"> (<i>int</i> / </span><span data-if="dotnet" style="display:none">long)</span><span data-if="cpp" style="display:none"> (<i>Hlong</i>)</span><span data-if="c" style="display:none"> (<i>Hlong</i>)</span></span>
</div>
<p class="pardesc">Minimum distance of two maxima in the Hough image
(direction: distance).</p>
<p class="pardesc"><span class="parcat">Default:
      </span>5</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>0
          ≤
        
    <span data-if="hdevelop" style="display:inline">DistGap</span>
    <span data-if="c" style="display:none">DistGap</span>
    <span data-if="cpp" style="display:none">DistGap</span>
    <span data-if="com" style="display:none">DistGap</span>
    <span data-if="dotnet" style="display:none">distGap</span>
    <span data-if="python" style="display:none">dist_gap</span>
    </code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="GenLines" class="parname"><b><code><span data-if="hdevelop" style="display:inline">GenLines</span><span data-if="c" style="display:none">GenLines</span><span data-if="cpp" style="display:none">GenLines</span><span data-if="com" style="display:none">GenLines</span><span data-if="dotnet" style="display:none">genLines</span><span data-if="python" style="display:none">gen_lines</span></code></b> (input_control)  </span><span>string <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">str</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (string)</span><span data-if="dotnet" style="display:none"> (<i>string</i>)</span><span data-if="cpp" style="display:none"> (<i>HString</i>)</span><span data-if="c" style="display:none"> (<i>char*</i>)</span></span>
</div>
<p class="pardesc">Create line regions if <i><span data-if="hdevelop" style="display:inline">'true'</span><span data-if="c" style="display:none">"true"</span><span data-if="cpp" style="display:none">"true"</span><span data-if="com" style="display:none">"true"</span><span data-if="dotnet" style="display:none">"true"</span><span data-if="python" style="display:none">"true"</span></i>.</p>
<p class="pardesc"><span class="parcat">Default:
      </span>
    <span data-if="hdevelop" style="display:inline">'true'</span>
    <span data-if="c" style="display:none">"true"</span>
    <span data-if="cpp" style="display:none">"true"</span>
    <span data-if="com" style="display:none">"true"</span>
    <span data-if="dotnet" style="display:none">"true"</span>
    <span data-if="python" style="display:none">"true"</span>
</p>
<p class="pardesc"><span class="parcat">List of values:
      </span><span data-if="hdevelop" style="display:inline">'false'</span><span data-if="c" style="display:none">"false"</span><span data-if="cpp" style="display:none">"false"</span><span data-if="com" style="display:none">"false"</span><span data-if="dotnet" style="display:none">"false"</span><span data-if="python" style="display:none">"false"</span>, <span data-if="hdevelop" style="display:inline">'true'</span><span data-if="c" style="display:none">"true"</span><span data-if="cpp" style="display:none">"true"</span><span data-if="com" style="display:none">"true"</span><span data-if="dotnet" style="display:none">"true"</span><span data-if="python" style="display:none">"true"</span></p>
</div>
  <div class="par">
<div class="parhead">
<span id="Angle" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Angle</span><span data-if="c" style="display:none">Angle</span><span data-if="cpp" style="display:none">Angle</span><span data-if="com" style="display:none">Angle</span><span data-if="dotnet" style="display:none">angle</span><span data-if="python" style="display:none">angle</span></code></b> (output_control)  </span><span>hesseline.angle.rad-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Angles (in radians) of the detected lines' normal
vectors.</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>-1.5707963
          ≤
        
    <span data-if="hdevelop" style="display:inline">Angle</span>
    <span data-if="c" style="display:none">Angle</span>
    <span data-if="cpp" style="display:none">Angle</span>
    <span data-if="com" style="display:none">Angle</span>
    <span data-if="dotnet" style="display:none">angle</span>
    <span data-if="python" style="display:none">angle</span>
    
          ≤
          3.1415927</code></p>
</div>
  <div class="par">
<div class="parhead">
<span id="Dist" class="parname"><b><code><span data-if="hdevelop" style="display:inline">Dist</span><span data-if="c" style="display:none">Dist</span><span data-if="cpp" style="display:none">Dist</span><span data-if="com" style="display:none">Dist</span><span data-if="dotnet" style="display:none">dist</span><span data-if="python" style="display:none">dist</span></code></b> (output_control)  </span><span>hesseline.distance-array <code>→</code> <span data-if="dotnet" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="python" style="display:none">Sequence[float]</span><span data-if="cpp" style="display:none"><a href="HTuple.html">HTuple</a></span><span data-if="c" style="display:none">Htuple</span><span data-if="hdevelop" style="display:inline"> (real)</span><span data-if="dotnet" style="display:none"> (<i>double</i>)</span><span data-if="cpp" style="display:none"> (<i>double</i>)</span><span data-if="c" style="display:none"> (<i>double</i>)</span></span>
</div>
<p class="pardesc">Distance of the detected lines from the origin.</p>
<p class="pardesc"><span class="parcat">Number of elements:
      </span>Dist == Angle</p>
<p class="pardesc"><span class="parcat">Value range:
      </span><code>0
          ≤
        
    <span data-if="hdevelop" style="display:inline">Dist</span>
    <span data-if="c" style="display:none">Dist</span>
    <span data-if="cpp" style="display:none">Dist</span>
    <span data-if="com" style="display:none">Dist</span>
    <span data-if="dotnet" style="display:none">dist</span>
    <span data-if="python" style="display:none">dist</span>
    </code></p>
</div>
<h2 id="sec_result">结果</h2>
<p>该算子 <a href="hough_lines.html"><code><span data-if="hdevelop" style="display:inline">hough_lines</span><span data-if="c" style="display:none">hough_lines</span><span data-if="cpp" style="display:none">HoughLines</span><span data-if="com" style="display:none">HoughLines</span><span data-if="dotnet" style="display:none">HoughLines</span><span data-if="python" style="display:none">hough_lines</span></code></a> 返回值 <TT>2</TT> (
      <TT>H_MSG_TRUE</TT>)
    
if the input is not empty.
The behavior in case of empty input (no input regions available) is
set via 该算子 <a href="set_system.html"><code><span data-if="hdevelop" style="display:inline">set_system('no_object_result',&lt;Result&gt;)</span><span data-if="c" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span><span data-if="cpp" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="com" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="dotnet" style="display:none">SetSystem("no_object_result",&lt;Result&gt;)</span><span data-if="python" style="display:none">set_system("no_object_result",&lt;Result&gt;)</span></code></a>.
If necessary an exception is raised.</p>
<h2 id="sec_predecessors">可能的前置算子</h2>
<p>
<code><a href="edges_image.html"><span data-if="hdevelop" style="display:inline">edges_image</span><span data-if="c" style="display:none">edges_image</span><span data-if="cpp" style="display:none">EdgesImage</span><span data-if="com" style="display:none">EdgesImage</span><span data-if="dotnet" style="display:none">EdgesImage</span><span data-if="python" style="display:none">edges_image</span></a></code>, 
<code><a href="sobel_dir.html"><span data-if="hdevelop" style="display:inline">sobel_dir</span><span data-if="c" style="display:none">sobel_dir</span><span data-if="cpp" style="display:none">SobelDir</span><span data-if="com" style="display:none">SobelDir</span><span data-if="dotnet" style="display:none">SobelDir</span><span data-if="python" style="display:none">sobel_dir</span></a></code>, 
<code><a href="threshold.html"><span data-if="hdevelop" style="display:inline">threshold</span><span data-if="c" style="display:none">threshold</span><span data-if="cpp" style="display:none">Threshold</span><span data-if="com" style="display:none">Threshold</span><span data-if="dotnet" style="display:none">Threshold</span><span data-if="python" style="display:none">threshold</span></a></code>, 
<code><a href="nonmax_suppression_dir.html"><span data-if="hdevelop" style="display:inline">nonmax_suppression_dir</span><span data-if="c" style="display:none">nonmax_suppression_dir</span><span data-if="cpp" style="display:none">NonmaxSuppressionDir</span><span data-if="com" style="display:none">NonmaxSuppressionDir</span><span data-if="dotnet" style="display:none">NonmaxSuppressionDir</span><span data-if="python" style="display:none">nonmax_suppression_dir</span></a></code>, 
<code><a href="reduce_domain.html"><span data-if="hdevelop" style="display:inline">reduce_domain</span><span data-if="c" style="display:none">reduce_domain</span><span data-if="cpp" style="display:none">ReduceDomain</span><span data-if="com" style="display:none">ReduceDomain</span><span data-if="dotnet" style="display:none">ReduceDomain</span><span data-if="python" style="display:none">reduce_domain</span></a></code>, 
<code><a href="skeleton.html"><span data-if="hdevelop" style="display:inline">skeleton</span><span data-if="c" style="display:none">skeleton</span><span data-if="cpp" style="display:none">Skeleton</span><span data-if="com" style="display:none">Skeleton</span><span data-if="dotnet" style="display:none">Skeleton</span><span data-if="python" style="display:none">skeleton</span></a></code>
</p>
<h2 id="sec_successors">可能的后置算子</h2>
<p>
<code><a href="gen_region_hline.html"><span data-if="hdevelop" style="display:inline">gen_region_hline</span><span data-if="c" style="display:none">gen_region_hline</span><span data-if="cpp" style="display:none">GenRegionHline</span><span data-if="com" style="display:none">GenRegionHline</span><span data-if="dotnet" style="display:none">GenRegionHline</span><span data-if="python" style="display:none">gen_region_hline</span></a></code>, 
<code><a href="select_matching_lines.html"><span data-if="hdevelop" style="display:inline">select_matching_lines</span><span data-if="c" style="display:none">select_matching_lines</span><span data-if="cpp" style="display:none">SelectMatchingLines</span><span data-if="com" style="display:none">SelectMatchingLines</span><span data-if="dotnet" style="display:none">SelectMatchingLines</span><span data-if="python" style="display:none">select_matching_lines</span></a></code>
</p>
<h2 id="sec_see">参考其它</h2>
<p>
<code><a href="hough_line_trans_dir.html"><span data-if="hdevelop" style="display:inline">hough_line_trans_dir</span><span data-if="c" style="display:none">hough_line_trans_dir</span><span data-if="cpp" style="display:none">HoughLineTransDir</span><span data-if="com" style="display:none">HoughLineTransDir</span><span data-if="dotnet" style="display:none">HoughLineTransDir</span><span data-if="python" style="display:none">hough_line_trans_dir</span></a></code>, 
<code><a href="hough_line_trans.html"><span data-if="hdevelop" style="display:inline">hough_line_trans</span><span data-if="c" style="display:none">hough_line_trans</span><span data-if="cpp" style="display:none">HoughLineTrans</span><span data-if="com" style="display:none">HoughLineTrans</span><span data-if="dotnet" style="display:none">HoughLineTrans</span><span data-if="python" style="display:none">hough_line_trans</span></a></code>, 
<code><a href="gen_region_hline.html"><span data-if="hdevelop" style="display:inline">gen_region_hline</span><span data-if="c" style="display:none">gen_region_hline</span><span data-if="cpp" style="display:none">GenRegionHline</span><span data-if="com" style="display:none">GenRegionHline</span><span data-if="dotnet" style="display:none">GenRegionHline</span><span data-if="python" style="display:none">gen_region_hline</span></a></code>, 
<code><a href="hough_circles.html"><span data-if="hdevelop" style="display:inline">hough_circles</span><span data-if="c" style="display:none">hough_circles</span><span data-if="cpp" style="display:none">HoughCircles</span><span data-if="com" style="display:none">HoughCircles</span><span data-if="dotnet" style="display:none">HoughCircles</span><span data-if="python" style="display:none">hough_circles</span></a></code>
</p>
<h2 id="sec_module">模块</h2>
<p>
Foundation</p>
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